package com.zdp.netty.chapter12.client;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.DatagramPacket;
import io.netty.channel.socket.nio.NioDatagramChannel;
import io.netty.util.CharsetUtil;

import java.net.InetSocketAddress;

/**
 * @Author zhengdp
 * @Description
 */
public class ChineseProverbClient {

    public void run(int port) throws Exception {
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b  =new Bootstrap();
            b.group(group)
                    .channel(NioDatagramChannel.class)
                    .option(ChannelOption.SO_BROADCAST,true)
                    .handler(new ChineseProverbClientHandler());
            Channel ch = b.bind(0).sync().channel();
            // 向网段内所有的机器广播UDP消息
            ch.writeAndFlush(
                    new DatagramPacket(Unpooled.copiedBuffer("谚语字典查询？", CharsetUtil.UTF_8),
                            new InetSocketAddress("255.255.255.255",port))
            ).sync();
            // 客户端等待15秒，用于接收服务端的应答消息
            if(!ch.closeFuture().await(15000)) {
                System.out.println("查询超时！");
            }
        } finally {
            group.shutdownGracefully();
        }
    }

    public static void main(String[] args) throws Exception{
        new ChineseProverbClient().run(8080);
    }

}
